Automatic gravity sawing

ABSTRACT

An angle, feed and speed, determining fixture for a portable power saber saw that firmly holds and guides the saw while performing its assigned cut-without the assistance or presence of an operator. The tool will automatically stop at the end of it&#39;&#39;s cut and the motor will also stop, with a limit switch conveniently located at the end of the cut. A motor speed control, located in the saber saw or on the fixture, maintains the proper speed for cutting different types of material while in operation. Once the material to be cut has been (set up) in this fixture, the only moving part is the complete power tool, created with the aid of gravity and friction plus the weight of the power tool as it slides down the guides of an inclined table. The angle of the table with the flanged guides, determines the &#39;&#39;&#39;&#39;feed of the cut.&#39;&#39;&#39;&#39; The &#39;&#39;&#39;&#39;speed&#39;&#39;&#39;&#39; is controlled by either the speed control built into the power tool or one that is an integeral part of the Automatic Gravity Sawing Fixture. The motivating power is gravitational feed. A single operator can therefore operate a multitude of Automatic Gravity Sawing Fixtures, depending on the compositional nature of the material being cut. A pine two-by-four can be cross cut sawed in about 45 seconds when the table angle is set at about 45* with the proper size blade installed in the saber saw. Naturally, angle iron or iron bar stock needs a slower feed and speed, so, the adjustment must be made accordingly. All correlationship between speed and feed is left to the discretion of the operator.

ambor States Patent [1 1 AUTOMATIC GRAVITY SAWING [76] Inventor: DorothyE. Jambor, 2157 Marne Ave., Milwaukee, Wis.

22 Filed: Dec. 29, 1970 21 Appl. No.: 68,862

[52] US. Cl 83/766, 83/762, 83/756,

83/753, 144/134 R, 144/136 R [51] Int. Cl B27b 27/06, B27b 19/08 [58]Field of Search 143/47 F, 47 R, 41 R,

Primary Examiner-Donald R. Schran [57] ABSTRACT An angle, feed andspeed, determining fixture for a portable power saber saw that firmlyholds and guides [4 1 Get. 3, 1973 the saw while performing its assignedcut-without the assistance or presence of an operator. The tool willautomatically stop at the end of its out and the motor will also stop,with a limit switch conveniently located at the end of the cut. A motorspeed control, located in the saber saw or on the fixture, maintains theproper speed for cutting different types of material while in operation.Once the material to be cut has been (set up) in this fixture, the onlymoving part is the complete power tool, created with the aid of gravityand friction plus the weight of the power tool as it slides down theguides of an inclined table. The angle of the table with the flangedguides, determines the feed of the cut. The speed is controlled byeither the speed control built into the power tool or one that is anintegeral part of the Automatic Gravity Sawing Fixture. The motivatingpower is gravitational feed. A single operator can therefore operate amultitude of Automatic Gravity Sawing Fixtures, depending on thecompositional nature of the material being cut. A pine two-by-four canbe cross cut sawed in about 45 seconds when the table angle is set atabout 45 with the proper size blade installed in the saber saw.Naturally, angle iron or iron bar stock needs a slower feed and speed,so, the adjustment must be made accordingly. All correlationship betweenspeed and feed is left to the discretion of the operator.

1 Claim, 4 Drawing Figures AUTOMATIC GRAVITY SAWING BACKGROUND OF THEINVENTION This invention relates to the sawing or cutting of wood,plastic, or metallic material wherein the cutting element or membercomprises a sabre saw, circle saw or any type of rotating or oscillatingpower tool traveling a fixed guide superimposed on the material beingworked. This operation may be done manually or by its unique automaticgravity feed involvement in creating work the presence of an operator.

Guide means for guiding power driven tools is not, per se, new. However,the known prior art devices for guiding power driven tools are, for themost part, impractical and limited in application. Due to the absence ofan operator during the cutting operation of the gravity sawing orcutting of the material, the guides must be constructed with the propergroove or the proper flange so that the fixture completely captivatesthe motorized power tool. The motorized power tool must never be in aposition of working itself loose, even at its uppermost vertical workingposition.

The table tilting and protracting in the usage of power tools is not,per se, new. However, the unique design of using the combination ofthese principles plus the use of the laws of gravity, creates a newcombination of effort to establish work without undue effort.

SUMMARY This invention relates to an automatic gravity sawing or cuttingfixture. More particularly, to an automatic gravity sawing or cuttingfixture with its usage of a motorized power tool, will perform its workwithout the assistance of an operator. Upon the turning on of theelectrical power leading to the fixture, the motorized power tool will,with only the aid of gravity, cut and then completely turn off the powerupon completion of the cut. The protractor used on the table of thefixture is one of several types that may be constructed to aid increating the angle or compound angle that may be required. The tabletilting angle, which is also the major gravity performing angle, may beaccomplished by a pivot as illustrated or the entire fixture can bemounted on a good ball and socket type of tripod. This type of placementfor the fixture would eliminate many problems of storage, compoundconfigurations of angles, etc. It makes a compact, yet a practical standfor the operation of the work to be done in a automatic gravity sawingor cutting fixture.

Since this invention is one of an automatic device using many commonlyused mechanical devices in its composition and workability, the oneclaim of the unique gravitational feed accomplishment is the only claimto which this invention is being adhered to. This preferred embodimentis contained in the following description to aid in the making anAutomatic Gravity Sawing Fixture. Although, the drawings adequatelydisplay one of the many designs to be used in the accomplishment, itsconstruction and style are of many deviations. The model illustratedwill cut with a motorized variable speed sabre saw, any angle orcompound angle. It will at the completion of its cut, with the aid of anelectrical limit switch, come to a complete stop. With the adjustmentfor gravitational feed, the sabre saw will gradually slide down and cutthe material to be cut. The entire sawing operation plus the stopping ofthe power tool is achieved without the presence of an operator. Thespeed and feed of the power tool in an Automatic Gravity Saw and CuttingFixture is left to the discretion of the operator since many factorsmust be considered: the best gravity angle, the best type of tool (teethper inch plus grade of blade), the type of material to be cut, theweight of the power tool. Since weight and friction are two physicalfactors that control the action of gravitational effort, the operatormust de termine all the physical characteristics that concern the typeout and type of material to be worked on when the set-up is made.

THE ILLUSTRATED CONSTRUCTION This model is one of many styles ofAutomatic Gravity Saw or Cutting Fixtures that may be constructed. Theconstruction of this model contains the inherent quality of the uniquegravitational action that makes the automatic motion of the powermachine tool possible. When constructed with care of fit of all parts,the finished machined piece will surpass most efforts made by a hand fedmachined piece. This is due to the erratic nature of most machineoperators. Undue hand feeding pressure, with a hand pressure feed,causes the machine to react accordingly, resulting in irregular andforced cuts.

The automatic gravity portion of cut is precise due to the inheritentquality of automatic controlled gravity undisturbed by a human being.That is the reason for a reasonable toolsetting of the operator at thestart of the run. From that point on, the operator has only to take outthe finished material and clamp in the new piece to be cut. if similiarpieces are required. The only moving part of this fixture is the poweredsaw activated by its sawing action plus the laws of gravity.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is the top view of an orthographic projection of the entiregravity fixture constructed in accordance with the present invention.The saw table is shown in detail to illustrate its compositional nature.

FIG. 2 is the side view of an orthographic projection of the entiregravity fixture. It illustrates a detailed view of the table in thehorizontal position.

FIG. 3 is a detailed front view with the table in a horizontal position.

FIG 4 is another side view, FIG. 4 being the same side view as in FIG.2, although, illustrating thesaw action position with the saw mounted inthe fixture at an arbitrarily selected position to make the desiredgravity fed cut.

DETAILED DESCRIPTION OF THE INVENTION In the drawings on the first sheetthe three views shown are in orthographic projection. The top view(FIG. 1) shows the protracting table (7). The table (7) used in thismodel was a sheet of metal containing a slot through which a saw bladecould protrude to cut material. Two radial slots permit the twoprotracting table fastening screws (10) to loosen the table, thenrevolve it around shoulder bolt (12).. This allows the table to pivotinto the desired protractor angle. Tightening fastening screws (10)secures the table (7). The inner radius slot of the table is a clearanceslot for the rocker arm adjustment screw (13). This screw along with theentire stock clamp rocker arm (5) assembly are moved to the oppositehinge (16) position when the rocker arm (5) is endangered. The two powertool guide strips (6) are flanged to completely captivate the powertool. They are properly fused or fastened with screws (9) parallel withthe center line of the table (7). An angle iron secondray base (8) isnext fastened (10) (12) to the table (7). The secondary base (8) hasthree items attached to it. A wood block (4) is cemented to thesecondary base (8). It serves to protect the blade or tool. On the samesurface, a unique clamp rocker arm hinge (16) is mounted that containstwo alternate positions to install clamp rocker arm (5) relative to theprotracted position of table (7). This hinge (16) may also be fused orfastened with screws to the angle iron secondary base (8). The inclineadjuster (3) of the type shown with a pivot screw (11) controlling thetable angle incline or a ball and socket mounted upon a tripod couldreplace the entire base stand (2) (3) (ll) (14) and (18). This solvesthe problem of fixture placement, storage and flexibility. Thecombinations of weight versus friction being the determing factor in thechoice of tool and the choice of fixture angle in an automatic deviceusing gravity as its motivational power allows for versatility inconstruction of an Automatic Gravity Sawing or Cutting Fixture. It canbe Built with a sled consisting of a single sheet of plastic or metalmaterial, square or rectangular and slightly larger than the base of thepower tool or tools to be used. Fusion, welding, or other clampingmethods may be used to fasten the power tool to the sled of the fixture.The fixture illustrated is ideal for anything small than a 2 inches X 4inches stock of material (1) of unlimited length. It can be designatedto suit the user. The rocker arm pivot pin (15) is held in with a setscrew. The power tool stop may be a pin (17) or a limit switch. Therocker arm stud (19) and the rubber tip (20) holds the stock to be cut.The alternate hole (21) is used when cutting interference causes rockerarm (5) to move to its alternative position. The power tool (22) may beany power tool that saws, cuts, routs, grinds or performs any operationthat is applicable to automatic gravity feed. Some models of power toolsare too light in weight, but this weight problem may be rectified by asled type of adaptable weight structure that allieviates this problem.The sled used in the gravity adjustable table may be a single square,thin sheet of metal. Naturally it must closely fit the guides and be ofsufficient weight to properly aid in gravity feed. The amount ofadjustability of the gravity table is left to the descretion of theoperator. The thickness of the sled is also left to the discretion ofthe builder of the Automatic Gravity Sawing or Cutting Fixture. When thefixture is completely and conscientously constructed, it will saw or cutautomatically without the presence or assistance of an operator. Withthe aid of an electrical limit switch, the power tool will come to acomplete halt upon the completion of the cut.

I claim: 1. An Automatic Gravity Power Tool Fixture comprising:

a feed and speed determining angle table; said angle table having flangeguides along the length thereof to hold and guide a portable power toolalong a cutting path; a base stand having means extending upwardlytherefrom; a secondary base extending downwardly from the bottom of thesaid angle table; means hinging the upward extending means to thesecondary base for vertical swinging movement of said angle table; anglelocking means to hold the angle table in a selected vertical angle up tomaximum relative to the base stand; clamping means on the said secondarybase for holding cutting stock to the bottom of said angle table andagainst said secondary base in the path of guided tool; said angle tablebeing pivoted to said secondary base for adjusting the angle of theguide path relative to the clamped cutting stock; and means to lock theangle table at a selected relative to said secondary base and theclamped stock.

1. An Automatic Gravity wPower Tool Fixture comprising: a feed and speeddetermining angle table; said angle table having flange guides along thelength thereof to hold and guide a portable power tool along a cuttingpath; a base stand having means extending upwardly therefrom; asecondary base extending downwardly from the bottom of the said angletable; means hinging the upward extending means to the secondary basefor vertical swinging movement of said angle table; angle locking meansto hold the angle table in a selected vertical angle up to 90* maximumrelative to the base stand; clamping means on the said secondary basefor holding cutting stock to the bottom of said angle table and againstsaid secondary base in the path of guided tool; said angle table beingpivoted to said secondary base for adjusting the angle of the guide pathrelative to the clamped cutting stock; and means to lock the angle tableat a selected relative to said secondary base and the clamped stock.